Siderite from Panasqueira Mines, Portugal - image 1
Siderite from Panasqueira Mines, Portugal - image 2

Siderite from Panasqueira Mines, Portugal

$350.00

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Bright lustrous silver metallic crystals of arsenopyrite measuring to 3.5 x 2.8 x 1.2 cm in size coming up nicely from matrix with crystallized siderite. Displays nicely, this is in excellent condition. Really choice example for the species. The specimen comes with a previous label from the collection of Ray DeMark.The Panasqueira Mines in Beira Baixa, Portugal, opened in 1898 and, aside from a brief temporary closure in 2003, remain actively in operation today. Geologically, the deposit is hosted within a sequence of late Precambrian to Cambrian metasedimentary rocks, primarily consisting of greenschist-facies shales, slates, and greywackes of the Beira schist formation. The mineralization occurs as a sub-horizontal system of quartz veins rich in tungsten, tin, and copper, which are genetically related to an underlying hidden Hercynian granitic pluton emplaced during the Late Carboniferous period.

Product details

SpeciesSideriteArsenopyrite
SizeSmall Cabinet
Dimensions7.0 x 5.0 x 4.0 cm
Listed on09/29/2026
LocalityPortugal, Panasqueira Mines
SKU2062636

Current owner

WM
Weinrich MineralsFeatured
3,402 for sale·9 sold

Learn more

Siderite
Mineral guide
Learn about Siderite
warm-toned iron carbonate with sharp rhombohedra and occasional gemmy crystals; prized for luster, classic localities Harz, Panasqueira, Dal’negorsk.
Siderite
Regional guide
Siderite from Panasqueira Mines, Portugal
from Panasqueira, Portugal — lustrous tan to cream rhombohedra in rosettes and masses; a world-class, modern classic from a magmatic-hydrothermal vein.
Locality guide
Panasqueira Mines
Panasqueira Mines, Portugal — premier locality yielding tungsten, ferberite, arsenopyrite, fluorapatite, and colorful quartz associations prized by collectors.